That depends on the width of the tape, and exactly what you're going to do
to the cube with it.
If you want to cover the cube with the tape, and the tape is ' W ' cm wide,
then you need ( 512/W ) cm of tape to cover it completely.
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often in millimeters.
The answer depends on the size of the cube: it could be a micrometre, vernier callipers, a ruler, a tape measure.
You can buy many tapes with inches on one edge and metric on the other.
On a tape measure, 0.94 represents 94 hundredths of a unit, typically in inches or centimeters. This means it is just short of 1 unit, specifically 7/8 of an inch or approximately 24 centimeters. To visualize this on a standard tape measure, you would find the 7/8 mark, which is slightly before the 1-inch mark.
A tape measure or a ruler can be marked in any unit of length. Inches, centimeters, feet, and meters are popular. But it could just as well be kilometers, yards, or miles.